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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Y(FeO2)2 by Materials Project

YFe2O4 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Y3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Y–O bond distances ranging from 2.39–2.44 Å. There are two inequivalent Fe+2.50+ sites. In the first Fe+2.50+ site, Fe+2.50+ is bonded in a square co-planar geometry to four O2- atoms. There is two shorter (1.95 Å) and two longer (2.02 Å) Fe–O bond length. In the second Fe+2.50+ site, Fe+2.50+ is bonded in a square co-planar geometry to four O2- atoms. There is two shorter (1.95 Å) and two longer (2.03 Å) Fe–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Y3+ and two Fe+2.50+ atoms to form a mixture of distorted edge and corner-sharing OY2Fe2 tetrahedra. In the second O2- site, O2- is bonded to two equivalent Y3+ and two Fe+2.50+ atoms to form a mixture of distorted edge and corner-sharing OY2Fe2 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(FeO2)2 by Materials Project

YFe2O4 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Y3+ is bonded to six equivalent O2- atoms to form YO6 octahedra that share corners with six equivalent FeO5 trigonal bipyramids and edges with six equivalent YO6 octahedra. All Y–O bond lengths are 2.29 Å. Fe+2.50+ is bonded to five O2- atoms to form FeO5 trigonal bipyramids that share corners with three equivalent YO6 octahedra, corners with six equivalent FeO5 trigonal bipyramids, and edges with three equivalent FeO5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 62°. There are a spread of Fe–O bond distances ranging from 1.99–2.14 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to four equivalent Fe+2.50+ atoms to form OFe4 trigonal pyramids that share corners with four equivalent OY3Fe tetrahedra, corners with six equivalent OFe4 trigonal pyramids, and edges with three equivalent OFe4 trigonal pyramids. In the second O2- site, O2- is bonded to three equivalent Y3+ and one Fe+2.50+ atom to form OY3Fe tetrahedra that share corners with nine equivalent OY3Fe tetrahedra, corners with four equivalent OFe4 trigonal pyramids, and edges with three equivalent OY3Fe tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y(FeO2)2 by Materials Project

YFe2O4 is Spinel structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Y3+ is bonded to four O2- atoms to form YO4 tetrahedra that share corners with twelve FeO6 octahedra. The corner-sharing octahedra tilt angles range from 57–61°. There are one shorter (2.11 Å) and three longer (2.16 Å) Y–O bond lengths. There are two inequivalent Fe+2.50+ sites. In the first Fe+2.50+ site, Fe+2.50+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with six equivalent YO4 tetrahedra and edges with six FeO6 octahedra. All Fe–O bond lengths are 2.14 Å. In the second Fe+2.50+ site, Fe+2.50+ is bonded to six equivalent O2- atoms to form FeO6 octahedra that share corners with six equivalent YO4 tetrahedra and edges with six equivalent FeO6 octahedra. All Fe–O bond lengths are 2.08 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to one Y3+ and three Fe+2.50+ atoms to form a mixture of distorted corner and edge-sharing OYFe3 trigonal pyramids. In the second O2- site, O2- is bonded to one Y3+ and three equivalent Fe+2.50+ atoms to form a mixture of distorted corner and edge-sharing OYFe3 trigonal pyramids.

36 MATERIALS SCIENCE↗